kernel: ufs: validate cylinder group metadata before caching it

cve CVE-2026-97926 3 sources, 4 claims · Watch

Red Hat writes:
kernel: ufs: validate cylinder group metadata before caching it the claim

Severity they disagree: high GitHub advisories
HIGH NVD
moderate Red Hat
CVSS: 7 GitHub advisories
7 NVD
7 Red Hat
Vendor: Linux NVD
Product: Linux NVD
CWE: CWE-787 Red Hat

How far exploitation has got

No public code known
Proof of concept
Proof of concept, verified
A Metasploit module
Exploited in the wild
Used in ransomware campaigns

Timeline

2026-09-25	first spoke of it: In the Linux kernel, the following vulnerability has been resolved: ufs: validate cylinder group...	GitHub advisories
2026-09-25	first spoke of it: In the Linux kernel, the following vulnerability has been resolved: ufs: validate cylinder group metadata before caching it ufs_read_cylinder() copies the cylinder group index and the rotor positions straight from the on-disk group and caches them without any check: ucpi->c_cgx = fs32_to_cpu(sb, ucg->cg_cgx); ucpi->c_rotor = fs32_to_cpu(sb, ucg->cg_rotor); ucpi->c_frotor = fs32_to_cpu(sb, ucg->cg_frotor); ucpi->c_irotor = fs32_to_cpu(sb, ucg->cg_irotor); They are then used as indices during allocation and free: - c_cgx indexes the cylinder summary array as UFS_SB(sb)->fs_cs(ucpi->c_cgx), so a value past s_ncg writes a 32 bit count outside the s_csp allocation. - c_frotor becomes a bitmap scan start, start = c_frotor >> 3, and then length = ((s_fpg + 7) >> 3) - start. A start beyond the block bitmap wraps the unsigned length to a huge value, so ubh_scanc() walks far past the cylinder group buffers. c_irotor drives the inode bitmap the same way. A crafted image can set any of these freely, turning an ordinary allocation into an out of bounds access. Reject a cylinder group whose recorded index does not match the group being read, or whose rotors fall outside the group, before the metadata is cached. Valid filesystems keep cg_cgx equal to the group number and the rotors within the group, so only malformed images are rejected.	NVD
2026-09-25	first spoke of it: kernel: ufs: validate cylinder group metadata before caching it	Red Hat

What it is to other things

In words only, so not counted until a person confirms one:

affects	`linux/linux` NVD says “Linux · Linux”
made_by	`linux` NVD says “Linux”

Every value, with what each source said and its receipt

Property Source Said Means here

CVSS

cvss

GitHub advisories

receipt

Source: GitHub advisories
Said since: 2026-09-26 15:00 UTC
Last answered: 2026-10-06 13:46 UTC
Original: open at the source

This source has not kept a receipt for this claim yet. The next update that reads it will.

—

CVSS

cvss

NVD

receipt

Source: NVD
Its words: 7.0
Read by: field:cve.metrics.cvssMetricV31[type=Primary].cvssData.baseScore || field:cve.metrics.cvssMetricV31[].cvssData.baseScore
Said since: 2026-09-29 09:45 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "defaultStatus": "unaffected",
            "product": "Linux",
            "programFiles": [
              "fs/ufs/cylinder.c"
            ],
            "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
            "vendor": "Linux",
            "versions": [
              {
                "lessThan": "88cccb6beba136b73f0caf80e59457e1b3c0ca1e",
                "status": "affected",
                "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                "versionType": "git"
              },
              {
                "lessThan": "f560a9e33365c460827c735fd86435f9213f1aed",
                "status": "affected",
                "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                "versionType": "git"
              },
              {
                "lessThan": "e4c5cc9688c3e69d07d888853388549ae26c0521",
                "status": "affected",
                "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                "versionType": "git"
              },
              {
                "lessThan": "58c0c414b2b8d099d33da494a354fa836ca6c10b",
                "status": "affected",
                "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                "versionType": "git"
              },
              {
                "lessThan": "5902a95066883cf96fa15b2680694fc5dd0c7d11",
                "status": "affected",
                "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                "versionType": "git"
              },
              {
                "lessThan": "87b12dc360a002eb2d498aa4f01e84347019612d",
                "status": "affected",
                "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                "versionType": "git"
              },
              {
                "lessThan": "abde9eb33106850dfa367ad3965d3588bb8558d5",
                "status": "affected",
                "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                "versionType": "git"
              },
              {
                "lessThan": "c9d263be26806d388129fab8c6904bed197fc6af",
                "status": "affected",
                "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                "versionType": "git"
              }
            ]
          },
          {
            "defaultStatus": "affected",
            "product": "Linux",
            "programFiles": [
              "fs/ufs/cylinder.c"
            ],
            "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
            "vendor": "Linux",
            "versions": [
              {
                "status": "affected",
                "version": "2.6.12"
              },
              {
                "lessThan": "2.6.12",
                "status": "unaffected",
                "version": "0",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "5.10.*",
                "status": "unaffected",
                "version": "5.10.271",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "5.15.*",
                "status": "unaffected",
                "version": "5.15.222",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.1.*",
                "status": "unaffected",
                "version": "6.1.189",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.6.*",
                "status": "unaffected",
                "version": "6.6.158",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.12.*",
                "status": "unaffected",
                "version": "6.12.111",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.18.*",
                "status": "unaffected",
                "version": "6.18.53",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "7.2.*",
                "status": "unaffected",
                "version": "7.2.7",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "7.3-rc3",
                "versionType": "original_commit_for_fix"
              }
            ]
          }
        ],
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nufs: validate cylinder group metadata before caching it\n\nufs_read_cylinder() copies the cylinder group index and the rotor\npositions straight from the on-disk group and caches them without any\ncheck:\n\n\tucpi->c_cgx    = fs32_to_cpu(sb, ucg->cg_cgx);\n\tucpi->c_rotor  = fs32_to_cpu(sb, ucg->cg_rotor);\n\tucpi->c_frotor = fs32_to_cpu(sb, ucg->cg_frotor);\n\tucpi->c_irotor = fs32_to_cpu(sb, ucg->cg_irotor);\n\nThey are then used as indices during allocation and free:\n\n  - c_cgx indexes the cylinder summary array as\n    UFS_SB(sb)->fs_cs(ucpi->c_cgx), so a value past s_ncg writes a 32\n    bit count outside the s_csp allocation.\n\n  - c_frotor becomes a bitmap scan start, start = c_frotor >> 3, and\n    then length = ((s_fpg + 7) >> 3) - start. A start beyond the block\n    bitmap wraps the unsigned length to a huge value, so ubh_scanc()\n    walks far past the cylinder group buffers. c_irotor drives the\n    inode bitmap the same way.\n\nA crafted image can set any of these freely, turning an ordinary\nallocation into an out of bounds access.\n\nReject a cylinder group whose recorded index does not match the group\nbeing read, or whose rotors fall outside the group, before the metadata\nis cached. Valid filesystems keep cg_cgx equal to the group number and\nthe rotors within the group, so only malformed images are rejected."
      }
    ],
    "id": "CVE-2026-97926",
    "lastModified": "2026-10-03T11:18:10.417",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.0,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 1.0,
          "impactScore": 5.9,
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "type": "Secondary"
        }
      ]
    },
    "published": "2026-09-25T11:17:19.833",
    "references": [
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/58c0c414b2b8d099d33da494a354fa836ca6c10b"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/5902a95066883cf96fa15b2680694fc5dd0c7d11"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/87b12dc360a002eb2d498aa4f01e84347019612d"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/88cccb6beba136b73f0caf80e59457e1b3c0ca1e"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/abde9eb33106850dfa367ad3965d3588bb8558d5"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/c9d263be26806d388129fab8c6904bed197fc6af"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/e4c5cc9688c3e69d07d888853388549ae26c0521"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/f560a9e33365c460827c735fd86435f9213f1aed"
      }
    ],
    "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "vulnStatus": "Received"
  }
}

—

CVSS

cvss

Red Hat

receipt

Source: Red Hat
Its words: 7.0
Read by: field:cvss3_score
Said since: 2026-10-06 13:01 UTC
Last answered: 2026-10-06 13:02 UTC
Original: open at the source

What the source handed over

{
  "CVE": "CVE-2026-97926",
  "CWE": "CWE-787",
  "advisories": [],
  "affected_packages": [],
  "bugzilla": "2541308",
  "bugzilla_description": "kernel: ufs: validate cylinder group metadata before caching it",
  "cvss3_score": "7.0",
  "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "cvss_score": null,
  "cvss_scoring_vector": null,
  "package_state": null,
  "public_date": "2026-09-25T00:00:00Z",
  "resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-97926.json",
  "severity": "moderate"
}

—

CVSS vector

cvss_vector

not compared

NVD

CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

receipt

Source: NVD
Its words: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Read by: field:cve.metrics.cvssMetricV31[type=Primary].cvssData.vectorString || field:cve.metrics.cvssMetricV31[].cvssData.vectorString
Said since: 2026-10-06 12:31 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:31 UTC	CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
2026-09-29 09:45 UTC	—

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "defaultStatus": "unaffected",
            "product": "Linux",
            "programFiles": [
              "fs/ufs/cylinder.c"
            ],
            "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
            "vendor": "Linux",
            "versions": [
              {
                "lessThan": "88cccb6beba136b73f0caf80e59457e1b3c0ca1e",
                "status": "affected",
                "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                "versionType": "git"
              },
              {
                "lessThan": "f560a9e33365c460827c735fd86435f9213f1aed",
                "status": "affected",
                "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                "versionType": "git"
              },
              {
                "lessThan": "e4c5cc9688c3e69d07d888853388549ae26c0521",
                "status": "affected",
                "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                "versionType": "git"
              },
              {
                "lessThan": "58c0c414b2b8d099d33da494a354fa836ca6c10b",
                "status": "affected",
                "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                "versionType": "git"
              },
              {
                "lessThan": "5902a95066883cf96fa15b2680694fc5dd0c7d11",
                "status": "affected",
                "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                "versionType": "git"
              },
              {
                "lessThan": "87b12dc360a002eb2d498aa4f01e84347019612d",
                "status": "affected",
                "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                "versionType": "git"
              },
              {
                "lessThan": "abde9eb33106850dfa367ad3965d3588bb8558d5",
                "status": "affected",
                "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                "versionType": "git"
              },
              {
                "lessThan": "c9d263be26806d388129fab8c6904bed197fc6af",
                "status": "affected",
                "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                "versionType": "git"
              }
            ]
          },
          {
            "defaultStatus": "affected",
            "product": "Linux",
            "programFiles": [
              "fs/ufs/cylinder.c"
            ],
            "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
            "vendor": "Linux",
            "versions": [
              {
                "status": "affected",
                "version": "2.6.12"
              },
              {
                "lessThan": "2.6.12",
                "status": "unaffected",
                "version": "0",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "5.10.*",
                "status": "unaffected",
                "version": "5.10.271",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "5.15.*",
                "status": "unaffected",
                "version": "5.15.222",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.1.*",
                "status": "unaffected",
                "version": "6.1.189",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.6.*",
                "status": "unaffected",
                "version": "6.6.158",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.12.*",
                "status": "unaffected",
                "version": "6.12.111",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.18.*",
                "status": "unaffected",
                "version": "6.18.53",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "7.2.*",
                "status": "unaffected",
                "version": "7.2.7",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "7.3-rc3",
                "versionType": "original_commit_for_fix"
              }
            ]
          }
        ],
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nufs: validate cylinder group metadata before caching it\n\nufs_read_cylinder() copies the cylinder group index and the rotor\npositions straight from the on-disk group and caches them without any\ncheck:\n\n\tucpi->c_cgx    = fs32_to_cpu(sb, ucg->cg_cgx);\n\tucpi->c_rotor  = fs32_to_cpu(sb, ucg->cg_rotor);\n\tucpi->c_frotor = fs32_to_cpu(sb, ucg->cg_frotor);\n\tucpi->c_irotor = fs32_to_cpu(sb, ucg->cg_irotor);\n\nThey are then used as indices during allocation and free:\n\n  - c_cgx indexes the cylinder summary array as\n    UFS_SB(sb)->fs_cs(ucpi->c_cgx), so a value past s_ncg writes a 32\n    bit count outside the s_csp allocation.\n\n  - c_frotor becomes a bitmap scan start, start = c_frotor >> 3, and\n    then length = ((s_fpg + 7) >> 3) - start. A start beyond the block\n    bitmap wraps the unsigned length to a huge value, so ubh_scanc()\n    walks far past the cylinder group buffers. c_irotor drives the\n    inode bitmap the same way.\n\nA crafted image can set any of these freely, turning an ordinary\nallocation into an out of bounds access.\n\nReject a cylinder group whose recorded index does not match the group\nbeing read, or whose rotors fall outside the group, before the metadata\nis cached. Valid filesystems keep cg_cgx equal to the group number and\nthe rotors within the group, so only malformed images are rejected."
      }
    ],
    "id": "CVE-2026-97926",
    "lastModified": "2026-10-03T11:18:10.417",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.0,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 1.0,
          "impactScore": 5.9,
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "type": "Secondary"
        }
      ]
    },
    "published": "2026-09-25T11:17:19.833",
    "references": [
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/58c0c414b2b8d099d33da494a354fa836ca6c10b"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/5902a95066883cf96fa15b2680694fc5dd0c7d11"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/87b12dc360a002eb2d498aa4f01e84347019612d"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/88cccb6beba136b73f0caf80e59457e1b3c0ca1e"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/abde9eb33106850dfa367ad3965d3588bb8558d5"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/c9d263be26806d388129fab8c6904bed197fc6af"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/e4c5cc9688c3e69d07d888853388549ae26c0521"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/f560a9e33365c460827c735fd86435f9213f1aed"
      }
    ],
    "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "vulnStatus": "Received"
  }
}

—

CVSS vector

cvss_vector

not compared

Red Hat

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

receipt

Source: Red Hat
Its words: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Read by: field:cvss3_scoring_vector
Said since: 2026-10-06 13:01 UTC
Last answered: 2026-10-06 13:02 UTC
Original: open at the source

What the source handed over

{
  "CVE": "CVE-2026-97926",
  "CWE": "CWE-787",
  "advisories": [],
  "affected_packages": [],
  "bugzilla": "2541308",
  "bugzilla_description": "kernel: ufs: validate cylinder group metadata before caching it",
  "cvss3_score": "7.0",
  "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "cvss_score": null,
  "cvss_scoring_vector": null,
  "package_state": null,
  "public_date": "2026-09-25T00:00:00Z",
  "resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-97926.json",
  "severity": "moderate"
}

—

CWE

cwe

Red Hat

CWE-787

receipt

Source: Red Hat
Its words: CWE-787
Read by: field:CWE
Said since: 2026-10-06 13:01 UTC
Last answered: 2026-10-06 13:02 UTC
Original: open at the source

What the source handed over

{
  "CVE": "CVE-2026-97926",
  "CWE": "CWE-787",
  "advisories": [],
  "affected_packages": [],
  "bugzilla": "2541308",
  "bugzilla_description": "kernel: ufs: validate cylinder group metadata before caching it",
  "cvss3_score": "7.0",
  "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "cvss_score": null,
  "cvss_scoring_vector": null,
  "package_state": null,
  "public_date": "2026-09-25T00:00:00Z",
  "resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-97926.json",
  "severity": "moderate"
}

—

Product

product

NVD

Linux

receipt

Source: NVD
Its words: Linux
Read by: field:cve.affected[].affectedData[].product
Said since: 2026-09-29 17:49 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-09-29 17:49 UTC	Linux
2026-09-29 09:45 UTC	—

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "defaultStatus": "unaffected",
            "product": "Linux",
            "programFiles": [
              "fs/ufs/cylinder.c"
            ],
            "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
            "vendor": "Linux",
            "versions": [
              {
                "lessThan": "88cccb6beba136b73f0caf80e59457e1b3c0ca1e",
                "status": "affected",
                "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                "versionType": "git"
              },
              {
                "lessThan": "f560a9e33365c460827c735fd86435f9213f1aed",
                "status": "affected",
                "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                "versionType": "git"
              },
              {
                "lessThan": "e4c5cc9688c3e69d07d888853388549ae26c0521",
                "status": "affected",
                "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                "versionType": "git"
              },
              {
                "lessThan": "58c0c414b2b8d099d33da494a354fa836ca6c10b",
                "status": "affected",
                "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                "versionType": "git"
              },
              {
                "lessThan": "5902a95066883cf96fa15b2680694fc5dd0c7d11",
                "status": "affected",
                "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                "versionType": "git"
              },
              {
                "lessThan": "87b12dc360a002eb2d498aa4f01e84347019612d",
                "status": "affected",
                "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                "versionType": "git"
              },
              {
                "lessThan": "abde9eb33106850dfa367ad3965d3588bb8558d5",
                "status": "affected",
                "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                "versionType": "git"
              },
              {
                "lessThan": "c9d263be26806d388129fab8c6904bed197fc6af",
                "status": "affected",
                "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                "versionType": "git"
              }
            ]
          },
          {
            "defaultStatus": "affected",
            "product": "Linux",
            "programFiles": [
              "fs/ufs/cylinder.c"
            ],
            "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
            "vendor": "Linux",
            "versions": [
              {
                "status": "affected",
                "version": "2.6.12"
              },
              {
                "lessThan": "2.6.12",
                "status": "unaffected",
                "version": "0",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "5.10.*",
                "status": "unaffected",
                "version": "5.10.271",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "5.15.*",
                "status": "unaffected",
                "version": "5.15.222",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.1.*",
                "status": "unaffected",
                "version": "6.1.189",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.6.*",
                "status": "unaffected",
                "version": "6.6.158",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.12.*",
                "status": "unaffected",
                "version": "6.12.111",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.18.*",
                "status": "unaffected",
                "version": "6.18.53",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "7.2.*",
                "status": "unaffected",
                "version": "7.2.7",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "7.3-rc3",
                "versionType": "original_commit_for_fix"
              }
            ]
          }
        ],
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nufs: validate cylinder group metadata before caching it\n\nufs_read_cylinder() copies the cylinder group index and the rotor\npositions straight from the on-disk group and caches them without any\ncheck:\n\n\tucpi->c_cgx    = fs32_to_cpu(sb, ucg->cg_cgx);\n\tucpi->c_rotor  = fs32_to_cpu(sb, ucg->cg_rotor);\n\tucpi->c_frotor = fs32_to_cpu(sb, ucg->cg_frotor);\n\tucpi->c_irotor = fs32_to_cpu(sb, ucg->cg_irotor);\n\nThey are then used as indices during allocation and free:\n\n  - c_cgx indexes the cylinder summary array as\n    UFS_SB(sb)->fs_cs(ucpi->c_cgx), so a value past s_ncg writes a 32\n    bit count outside the s_csp allocation.\n\n  - c_frotor becomes a bitmap scan start, start = c_frotor >> 3, and\n    then length = ((s_fpg + 7) >> 3) - start. A start beyond the block\n    bitmap wraps the unsigned length to a huge value, so ubh_scanc()\n    walks far past the cylinder group buffers. c_irotor drives the\n    inode bitmap the same way.\n\nA crafted image can set any of these freely, turning an ordinary\nallocation into an out of bounds access.\n\nReject a cylinder group whose recorded index does not match the group\nbeing read, or whose rotors fall outside the group, before the metadata\nis cached. Valid filesystems keep cg_cgx equal to the group number and\nthe rotors within the group, so only malformed images are rejected."
      }
    ],
    "id": "CVE-2026-97926",
    "lastModified": "2026-10-03T11:18:10.417",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.0,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 1.0,
          "impactScore": 5.9,
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "type": "Secondary"
        }
      ]
    },
    "published": "2026-09-25T11:17:19.833",
    "references": [
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/58c0c414b2b8d099d33da494a354fa836ca6c10b"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/5902a95066883cf96fa15b2680694fc5dd0c7d11"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/87b12dc360a002eb2d498aa4f01e84347019612d"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/88cccb6beba136b73f0caf80e59457e1b3c0ca1e"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/abde9eb33106850dfa367ad3965d3588bb8558d5"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/c9d263be26806d388129fab8c6904bed197fc6af"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/e4c5cc9688c3e69d07d888853388549ae26c0521"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/f560a9e33365c460827c735fd86435f9213f1aed"
      }
    ],
    "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "vulnStatus": "Received"
  }
}

—

Severity

severity

conflict

GitHub advisories

high

From 7.0 to 8.9.

receipt

Source: GitHub advisories
Said since: 2026-09-26 15:00 UTC
Last answered: 2026-10-06 13:46 UTC
Original: open at the source

This source has not kept a receipt for this claim yet. The next update that reads it will.

—

Severity

severity

conflict

NVD

HIGH

From 7.0 to 8.9.

receipt

Source: NVD
Its words: HIGH
Read by: field:cve.metrics.cvssMetricV31[type=Primary].cvssData.baseSeverity || field:cve.metrics.cvssMetricV31[].cvssData.baseSeverity
Said since: 2026-10-06 12:31 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:31 UTC	HIGH
2026-09-29 09:45 UTC	—

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "defaultStatus": "unaffected",
            "product": "Linux",
            "programFiles": [
              "fs/ufs/cylinder.c"
            ],
            "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
            "vendor": "Linux",
            "versions": [
              {
                "lessThan": "88cccb6beba136b73f0caf80e59457e1b3c0ca1e",
                "status": "affected",
                "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                "versionType": "git"
              },
              {
                "lessThan": "f560a9e33365c460827c735fd86435f9213f1aed",
                "status": "affected",
                "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                "versionType": "git"
              },
              {
                "lessThan": "e4c5cc9688c3e69d07d888853388549ae26c0521",
                "status": "affected",
                "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                "versionType": "git"
              },
              {
                "lessThan": "58c0c414b2b8d099d33da494a354fa836ca6c10b",
                "status": "affected",
                "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                "versionType": "git"
              },
              {
                "lessThan": "5902a95066883cf96fa15b2680694fc5dd0c7d11",
                "status": "affected",
                "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                "versionType": "git"
              },
              {
                "lessThan": "87b12dc360a002eb2d498aa4f01e84347019612d",
                "status": "affected",
                "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                "versionType": "git"
              },
              {
                "lessThan": "abde9eb33106850dfa367ad3965d3588bb8558d5",
                "status": "affected",
                "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                "versionType": "git"
              },
              {
                "lessThan": "c9d263be26806d388129fab8c6904bed197fc6af",
                "status": "affected",
                "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                "versionType": "git"
              }
            ]
          },
          {
            "defaultStatus": "affected",
            "product": "Linux",
            "programFiles": [
              "fs/ufs/cylinder.c"
            ],
            "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
            "vendor": "Linux",
            "versions": [
              {
                "status": "affected",
                "version": "2.6.12"
              },
              {
                "lessThan": "2.6.12",
                "status": "unaffected",
                "version": "0",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "5.10.*",
                "status": "unaffected",
                "version": "5.10.271",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "5.15.*",
                "status": "unaffected",
                "version": "5.15.222",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.1.*",
                "status": "unaffected",
                "version": "6.1.189",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.6.*",
                "status": "unaffected",
                "version": "6.6.158",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.12.*",
                "status": "unaffected",
                "version": "6.12.111",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.18.*",
                "status": "unaffected",
                "version": "6.18.53",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "7.2.*",
                "status": "unaffected",
                "version": "7.2.7",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "7.3-rc3",
                "versionType": "original_commit_for_fix"
              }
            ]
          }
        ],
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nufs: validate cylinder group metadata before caching it\n\nufs_read_cylinder() copies the cylinder group index and the rotor\npositions straight from the on-disk group and caches them without any\ncheck:\n\n\tucpi->c_cgx    = fs32_to_cpu(sb, ucg->cg_cgx);\n\tucpi->c_rotor  = fs32_to_cpu(sb, ucg->cg_rotor);\n\tucpi->c_frotor = fs32_to_cpu(sb, ucg->cg_frotor);\n\tucpi->c_irotor = fs32_to_cpu(sb, ucg->cg_irotor);\n\nThey are then used as indices during allocation and free:\n\n  - c_cgx indexes the cylinder summary array as\n    UFS_SB(sb)->fs_cs(ucpi->c_cgx), so a value past s_ncg writes a 32\n    bit count outside the s_csp allocation.\n\n  - c_frotor becomes a bitmap scan start, start = c_frotor >> 3, and\n    then length = ((s_fpg + 7) >> 3) - start. A start beyond the block\n    bitmap wraps the unsigned length to a huge value, so ubh_scanc()\n    walks far past the cylinder group buffers. c_irotor drives the\n    inode bitmap the same way.\n\nA crafted image can set any of these freely, turning an ordinary\nallocation into an out of bounds access.\n\nReject a cylinder group whose recorded index does not match the group\nbeing read, or whose rotors fall outside the group, before the metadata\nis cached. Valid filesystems keep cg_cgx equal to the group number and\nthe rotors within the group, so only malformed images are rejected."
      }
    ],
    "id": "CVE-2026-97926",
    "lastModified": "2026-10-03T11:18:10.417",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.0,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 1.0,
          "impactScore": 5.9,
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "type": "Secondary"
        }
      ]
    },
    "published": "2026-09-25T11:17:19.833",
    "references": [
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/58c0c414b2b8d099d33da494a354fa836ca6c10b"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/5902a95066883cf96fa15b2680694fc5dd0c7d11"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/87b12dc360a002eb2d498aa4f01e84347019612d"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/88cccb6beba136b73f0caf80e59457e1b3c0ca1e"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/abde9eb33106850dfa367ad3965d3588bb8558d5"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/c9d263be26806d388129fab8c6904bed197fc6af"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/e4c5cc9688c3e69d07d888853388549ae26c0521"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/f560a9e33365c460827c735fd86435f9213f1aed"
      }
    ],
    "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "vulnStatus": "Received"
  }
}

high

Severity

severity

conflict

Red Hat

moderate

A flaw that is harder to exploit, or whose impact is limited.

receipt

Source: Red Hat
Its words: moderate
Read by: field:severity
Said since: 2026-10-06 13:01 UTC
Last answered: 2026-10-06 13:02 UTC
Original: open at the source

What the source handed over

{
  "CVE": "CVE-2026-97926",
  "CWE": "CWE-787",
  "advisories": [],
  "affected_packages": [],
  "bugzilla": "2541308",
  "bugzilla_description": "kernel: ufs: validate cylinder group metadata before caching it",
  "cvss3_score": "7.0",
  "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "cvss_score": null,
  "cvss_scoring_vector": null,
  "package_state": null,
  "public_date": "2026-09-25T00:00:00Z",
  "resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-97926.json",
  "severity": "moderate"
}

medium

Status

status

NVD

Received

receipt

Source: NVD
Its words: Received
Read by: field:cve.vulnStatus
Said since: 2026-09-29 09:45 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "defaultStatus": "unaffected",
            "product": "Linux",
            "programFiles": [
              "fs/ufs/cylinder.c"
            ],
            "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
            "vendor": "Linux",
            "versions": [
              {
                "lessThan": "88cccb6beba136b73f0caf80e59457e1b3c0ca1e",
                "status": "affected",
                "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                "versionType": "git"
              },
              {
                "lessThan": "f560a9e33365c460827c735fd86435f9213f1aed",
                "status": "affected",
                "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                "versionType": "git"
              },
              {
                "lessThan": "e4c5cc9688c3e69d07d888853388549ae26c0521",
                "status": "affected",
                "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                "versionType": "git"
              },
              {
                "lessThan": "58c0c414b2b8d099d33da494a354fa836ca6c10b",
                "status": "affected",
                "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                "versionType": "git"
              },
              {
                "lessThan": "5902a95066883cf96fa15b2680694fc5dd0c7d11",
                "status": "affected",
                "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                "versionType": "git"
              },
              {
                "lessThan": "87b12dc360a002eb2d498aa4f01e84347019612d",
                "status": "affected",
                "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                "versionType": "git"
              },
              {
                "lessThan": "abde9eb33106850dfa367ad3965d3588bb8558d5",
                "status": "affected",
                "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                "versionType": "git"
              },
              {
                "lessThan": "c9d263be26806d388129fab8c6904bed197fc6af",
                "status": "affected",
                "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                "versionType": "git"
              }
            ]
          },
          {
            "defaultStatus": "affected",
            "product": "Linux",
            "programFiles": [
              "fs/ufs/cylinder.c"
            ],
            "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
            "vendor": "Linux",
            "versions": [
              {
                "status": "affected",
                "version": "2.6.12"
              },
              {
                "lessThan": "2.6.12",
                "status": "unaffected",
                "version": "0",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "5.10.*",
                "status": "unaffected",
                "version": "5.10.271",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "5.15.*",
                "status": "unaffected",
                "version": "5.15.222",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.1.*",
                "status": "unaffected",
                "version": "6.1.189",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.6.*",
                "status": "unaffected",
                "version": "6.6.158",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.12.*",
                "status": "unaffected",
                "version": "6.12.111",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.18.*",
                "status": "unaffected",
                "version": "6.18.53",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "7.2.*",
                "status": "unaffected",
                "version": "7.2.7",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "7.3-rc3",
                "versionType": "original_commit_for_fix"
              }
            ]
          }
        ],
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nufs: validate cylinder group metadata before caching it\n\nufs_read_cylinder() copies the cylinder group index and the rotor\npositions straight from the on-disk group and caches them without any\ncheck:\n\n\tucpi->c_cgx    = fs32_to_cpu(sb, ucg->cg_cgx);\n\tucpi->c_rotor  = fs32_to_cpu(sb, ucg->cg_rotor);\n\tucpi->c_frotor = fs32_to_cpu(sb, ucg->cg_frotor);\n\tucpi->c_irotor = fs32_to_cpu(sb, ucg->cg_irotor);\n\nThey are then used as indices during allocation and free:\n\n  - c_cgx indexes the cylinder summary array as\n    UFS_SB(sb)->fs_cs(ucpi->c_cgx), so a value past s_ncg writes a 32\n    bit count outside the s_csp allocation.\n\n  - c_frotor becomes a bitmap scan start, start = c_frotor >> 3, and\n    then length = ((s_fpg + 7) >> 3) - start. A start beyond the block\n    bitmap wraps the unsigned length to a huge value, so ubh_scanc()\n    walks far past the cylinder group buffers. c_irotor drives the\n    inode bitmap the same way.\n\nA crafted image can set any of these freely, turning an ordinary\nallocation into an out of bounds access.\n\nReject a cylinder group whose recorded index does not match the group\nbeing read, or whose rotors fall outside the group, before the metadata\nis cached. Valid filesystems keep cg_cgx equal to the group number and\nthe rotors within the group, so only malformed images are rejected."
      }
    ],
    "id": "CVE-2026-97926",
    "lastModified": "2026-10-03T11:18:10.417",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.0,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 1.0,
          "impactScore": 5.9,
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "type": "Secondary"
        }
      ]
    },
    "published": "2026-09-25T11:17:19.833",
    "references": [
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/58c0c414b2b8d099d33da494a354fa836ca6c10b"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/5902a95066883cf96fa15b2680694fc5dd0c7d11"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/87b12dc360a002eb2d498aa4f01e84347019612d"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/88cccb6beba136b73f0caf80e59457e1b3c0ca1e"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/abde9eb33106850dfa367ad3965d3588bb8558d5"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/c9d263be26806d388129fab8c6904bed197fc6af"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/e4c5cc9688c3e69d07d888853388549ae26c0521"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/f560a9e33365c460827c735fd86435f9213f1aed"
      }
    ],
    "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "vulnStatus": "Received"
  }
}

—

Vendor

vendor

NVD

Linux

receipt

Source: NVD
Its words: Linux
Read by: field:cve.affected[].affectedData[].vendor
Said since: 2026-09-29 17:49 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-09-29 17:49 UTC	Linux
2026-09-29 09:45 UTC	—

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "defaultStatus": "unaffected",
            "product": "Linux",
            "programFiles": [
              "fs/ufs/cylinder.c"
            ],
            "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
            "vendor": "Linux",
            "versions": [
              {
                "lessThan": "88cccb6beba136b73f0caf80e59457e1b3c0ca1e",
                "status": "affected",
                "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                "versionType": "git"
              },
              {
                "lessThan": "f560a9e33365c460827c735fd86435f9213f1aed",
                "status": "affected",
                "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                "versionType": "git"
              },
              {
                "lessThan": "e4c5cc9688c3e69d07d888853388549ae26c0521",
                "status": "affected",
                "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                "versionType": "git"
              },
              {
                "lessThan": "58c0c414b2b8d099d33da494a354fa836ca6c10b",
                "status": "affected",
                "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                "versionType": "git"
              },
              {
                "lessThan": "5902a95066883cf96fa15b2680694fc5dd0c7d11",
                "status": "affected",
                "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                "versionType": "git"
              },
              {
                "lessThan": "87b12dc360a002eb2d498aa4f01e84347019612d",
                "status": "affected",
                "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                "versionType": "git"
              },
              {
                "lessThan": "abde9eb33106850dfa367ad3965d3588bb8558d5",
                "status": "affected",
                "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                "versionType": "git"
              },
              {
                "lessThan": "c9d263be26806d388129fab8c6904bed197fc6af",
                "status": "affected",
                "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                "versionType": "git"
              }
            ]
          },
          {
            "defaultStatus": "affected",
            "product": "Linux",
            "programFiles": [
              "fs/ufs/cylinder.c"
            ],
            "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
            "vendor": "Linux",
            "versions": [
              {
                "status": "affected",
                "version": "2.6.12"
              },
              {
                "lessThan": "2.6.12",
                "status": "unaffected",
                "version": "0",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "5.10.*",
                "status": "unaffected",
                "version": "5.10.271",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "5.15.*",
                "status": "unaffected",
                "version": "5.15.222",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.1.*",
                "status": "unaffected",
                "version": "6.1.189",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.6.*",
                "status": "unaffected",
                "version": "6.6.158",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.12.*",
                "status": "unaffected",
                "version": "6.12.111",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.18.*",
                "status": "unaffected",
                "version": "6.18.53",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "7.2.*",
                "status": "unaffected",
                "version": "7.2.7",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "7.3-rc3",
                "versionType": "original_commit_for_fix"
              }
            ]
          }
        ],
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nufs: validate cylinder group metadata before caching it\n\nufs_read_cylinder() copies the cylinder group index and the rotor\npositions straight from the on-disk group and caches them without any\ncheck:\n\n\tucpi->c_cgx    = fs32_to_cpu(sb, ucg->cg_cgx);\n\tucpi->c_rotor  = fs32_to_cpu(sb, ucg->cg_rotor);\n\tucpi->c_frotor = fs32_to_cpu(sb, ucg->cg_frotor);\n\tucpi->c_irotor = fs32_to_cpu(sb, ucg->cg_irotor);\n\nThey are then used as indices during allocation and free:\n\n  - c_cgx indexes the cylinder summary array as\n    UFS_SB(sb)->fs_cs(ucpi->c_cgx), so a value past s_ncg writes a 32\n    bit count outside the s_csp allocation.\n\n  - c_frotor becomes a bitmap scan start, start = c_frotor >> 3, and\n    then length = ((s_fpg + 7) >> 3) - start. A start beyond the block\n    bitmap wraps the unsigned length to a huge value, so ubh_scanc()\n    walks far past the cylinder group buffers. c_irotor drives the\n    inode bitmap the same way.\n\nA crafted image can set any of these freely, turning an ordinary\nallocation into an out of bounds access.\n\nReject a cylinder group whose recorded index does not match the group\nbeing read, or whose rotors fall outside the group, before the metadata\nis cached. Valid filesystems keep cg_cgx equal to the group number and\nthe rotors within the group, so only malformed images are rejected."
      }
    ],
    "id": "CVE-2026-97926",
    "lastModified": "2026-10-03T11:18:10.417",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.0,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 1.0,
          "impactScore": 5.9,
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "type": "Secondary"
        }
      ]
    },
    "published": "2026-09-25T11:17:19.833",
    "references": [
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/58c0c414b2b8d099d33da494a354fa836ca6c10b"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/5902a95066883cf96fa15b2680694fc5dd0c7d11"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/87b12dc360a002eb2d498aa4f01e84347019612d"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/88cccb6beba136b73f0caf80e59457e1b3c0ca1e"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/abde9eb33106850dfa367ad3965d3588bb8558d5"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/c9d263be26806d388129fab8c6904bed197fc6af"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/e4c5cc9688c3e69d07d888853388549ae26c0521"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/f560a9e33365c460827c735fd86435f9213f1aed"
      }
    ],
    "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "vulnStatus": "Received"
  }
}

—

Every claim, by kind

vulnerability

kernel: ufs: validate cylinder group metadata before caching it zetlyn/cve-redhat · 2026-09-25	cvss 7 cvss_vector CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H cwe CWE-787 severity moderate	source
In the Linux kernel, the following vulnerability has been resolved: ufs: validate cylinder group metadata before caching it ufs_read_cylinder() copies the cylinder group index and the rotor positions straight from the on-disk group and caches them without any check: ucpi->c_cgx = fs32_to_cpu(sb, ucg->cg_cgx); ucpi->c_rotor = fs32_to_cpu(sb, ucg->cg_rotor); ucpi->c_frotor = fs32_to_cpu(sb, ucg->cg_frotor); ucpi->c_irotor = fs32_to_cpu(sb, ucg->cg_irotor); They are then used as indices during allocation and free: - c_cgx indexes the cylinder summary array as UFS_SB(sb)->fs_cs(ucpi->c_cgx), so a value past s_ncg writes a 32 bit count outside the s_csp allocation. - c_frotor becomes a bitmap scan start, start = c_frotor >> 3, and then length = ((s_fpg + 7) >> 3) - start. A start beyond the block bitmap wraps the unsigned length to a huge value, so ubh_scanc() walks far past the cylinder group buffers. c_irotor drives the inode bitmap the same way. A crafted image can set any of these freely, turning an ordinary allocation into an out of bounds access. Reject a cylinder group whose recorded index does not match the group being read, or whose rotors fall outside the group, before the metadata is cached. Valid filesystems keep cg_cgx equal to the group number and the rotors within the group, so only malformed images are rejected. zetlyn/cve-nvd · 2026-09-25	cvss 7 cvss_vector CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H product Linux severity HIGH status Received vendor Linux	source
In the Linux kernel, the following vulnerability has been resolved: ufs: validate cylinder group... zetlyn/cve-ghsa · 2026-09-25	cvss 7 severity high	source
In the Linux kernel, the following vulnerability has been resolved: ufs: validate cylinder group... zetlyn/cve-ghsa · 2026-09-25	cvss 7 severity high	source